Abstract
The crystal structures of hydro-thermally synthesized (T = 493 K, 7-9 d) ammonium gallium bis-[hydrogen arsenate(V)], (NH4)Ga(HAsO4)2, and thallium aluminium bis-[hydrogen arsenate(V)], TlAl(HAsO4)2, were solved by single-crystal X-ray diffraction. Both compounds crystallize in the common RbFe(HPO4)2 structure type (R c) and share the same tetra-hedral-octa-hedral framework topology that houses the M + cations in its channels. One of the two Tl sites is slightly offset from its ideal position. Strong O-H⋯O hydrogen bonds strengthen the network.
Highlights
Compounds with mixed tetrahedral–octahedral (T–O) framework structures feature a broad range of different atomic arrangements
Among the many different structure types found during our study, one atomic arrangement, the RbFe(HPO4)2 type (Lii & Wu, 1994; rhombohedral, R3c), was found to exhibit a large crystal–chemical flexibility, which allows the incorporation of a wide variety of M+ and M3+ cations
E74, 1504–1508 research communications penetrating channels, which host the M+ cations (Fig. 1). This structure type is closely related to the triclinic (NH4)Fe(HPO4)2 type (P1; Yakubovich, 1993) in which all other known (NH4)M3+(HTO4)2 (T = P, As) compounds crystallize, the RbAl2As(HAsO4)6 type (R3c; Schwendtner & Kolitsch, 2018a) and the RbAl(HAsO4)2 type (R32; Schwendtner & Kolitsch, 2018a)
Summary
Compounds with mixed tetrahedral–octahedral (T–O) framework structures feature a broad range of different atomic arrangements. Among the many different structure types found during our study, one atomic arrangement, the RbFe(HPO4) type (Lii & Wu, 1994; rhombohedral, R3c), was found to exhibit a large crystal–chemical flexibility, which allows the incorporation of a wide variety of M+ and M3+ cations. It was known for the phosphate members RbAl(HPO4) and RbGa(HPO4) (Lesage et al, 2007). It is noteworthy that no K members are currently known
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